ince most of our items are pre-orders for early prototypes, the box size is not 100% decided at the time pre-orders are placed, so it is impossible to give a 100% accurate shipping quote at that time. Which is one of the reasons we allow our collectors to cancel pre-orders with no penalty - if your final shipping cost on your invoice is too hefty due to the final size of the box, you can always cancel.
Thus, we do not have International shipping calculators on our site, as it would confuse the issue and provide false information based on estimates rather than actual sizes. But, as your item gets closer to shipping (for instance, when you receive the 'estimated arrival' email), you can call or email Customer Service for a shipping quote, instead of waiting until the final invoice is sent. We will also be providing some examples of 'before' and 'after' shipping for EU collectors in the statement on our site later today and more is planned for after the transition, in January.
As for USPS, they are perfectly fine for shipping small quantities (individual packages, maybe 10-20 at a time), but they are not equipped to handle shipments in the volume that we deal with (either internationally or domestically). Plus, tracking and reimbursement/claims are very inefficient with them.